Table 1. IBDV reference strains used in this study
| Strain | Origin | Genotype | Accession no | Strain | Origin | Genotype | Accession no |
| Lukert | USA | Genotype 1 | AY918948 | SHG49 | China | Genotype 2(G2d) | MH879104 |
| F52-70 | Germany | Genotype 1 | AY321953 | SHG165 | China | Genotype 2(G2d) | MH925084 |
| STC | Canada | Genotype 1 | D00499 | SHG232 | China | Genotype 2(G2d) | MH879119 |
| Int/228E | Taiwan | Genotype 1 | AF457104 | SHG352 | China | Genotype 2(G2d) | MH879130 |
| D78 | USA | Genotype 1 | AF499929 | ZD-2018-1 | China | Genotype 2(G2d) | MN485882 |
| CU-1 | China | Genotype 1 | X16107 | JBN2011 | Korea | Genotype 3 | MF188862 |
| V1 | USA | Genotype 2(G2a) | AF281235 | Chinju | Korea | Genotype 3 | AF508177 |
| 09D243 | Korea | Genotype 2(G2a) | GU646410 | OKYM | Japan | Genotype 3 | D49706 |
| variant E | USA | Genotype 2(G2a) | AF133904 | HuB-1 | China | Genotype 3 | EU042145 |
| AL-2 | USA | Genotype 2(G2a) | JF736011 | HK46 | China | Genotype 3 | AF051838 |
| T1 | USA | Genotype 2(G2b) | AF281238 | TY2 | Japan | Genotype 4 | LC136880 |
| 9109 | USA | Genotype 2(G2b) | AY462027 | K310 | Korea | Genotype 4 | AF165149 |
| 19D38 | Korea | Genotype 2(G2b) | MT550875 | SNU9414 | Korea | Genotype 4 | EU863754 |
| 19D44 | Korea | Genotype 2(G2b) | MT550876 | NVRI80029 | Korea | Genotype 4 | FJ000316 |
| 3-1 | USA | Genotype 2(G2c) | JX096965 | Mexico04M92 | Mexico | Genotype 5 | DQ916213 |
| OH20092N | USA | Genotype 2(G2c) | JX096986 | Mexico04M101 | Mexico | Genotype 5 | DQ916210 |
| 3 Ohio | USA | Genotype 2(G2c) | MF142529 | ITA-02 | Italy | Genotype 6 | JN852986 |
| 19D51 | Korea | Genotype 2(G2d) | MT550877 | IBDVRF-5/94 | Russia | Genotype 6 | Z97002 |
| 19D69 | Korea | Genotype 2(G2d) | MT550878 | 002/73 | Australia | Genotype 7 | AF148073 |
| 19D75 | Korea | Genotype 2(G2d) | MT550879 | 08/95 | Australia | Genotype 7 | AF148081 |
| SHG19 | China | Genotype 2(G2d) | MH879092 | V877-W | Australia | Genotype 7 | HM071991 |